Heat pump system for vehicle

ABSTRACT

A heat pump system for a vehicle may adjust a temperature of a battery module by use of one chiller that performs heat exchange between a refrigerant and a coolant and improve heating efficiency by use of waste heat generated from an electrical component and the battery module, and increase the flow rate of the refrigerant by applying the gas injection unit operates in the heating mode or the heating/dehumidification mode of the vehicle, reducing power consumption of the first compressor and maximizing heating performance.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority to Korean Patent Application No.10-2019-0107881 filed on Sep. 2, 2019, the entire contents of which isincorporated herein for all purposes by this reference.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a heat pump system for a vehicle. Moreparticularly, the present invention relates to a heat pump system for avehicle which adjusts a temperature of a battery module by use of onechiller that performs heat exchange between a refrigerant and a coolantand improves heating efficiency by use of waste heat generated from anelectrical component.

Description of Related Art

In general, an air conditioner for a vehicle includes an airconditioning system for circulating a coolant to heat or cool aninterior of the vehicle.

Such an air conditioner maintains a comfortable indoor environment bymaintaining an internal temperature of the vehicle at an appropriatelevel regardless of an external temperature change, so that the interiorof the vehicle is warmed or cooled through heat exchange by a condenserand an evaporator during a process in which a refrigerant discharged bydriving of a compressor circulates back to the compressor after passingthrough a condenser, a receiver dryer, an expansion valve, and anevaporator.

That is, the air conditioner system condenses a gaseous coolant of ahigh temperature and a high pressure compressed by the compressor in acooling mode in the summer to reduce a temperature and humidity of theinterior of the vehicle through evaporation in the evaporator throughthe receiver dryer and the expansion valve.

Meanwhile, in recent years, as interest in energy efficiency andenvironmental pollution has been increasing, there has been a demand forthe development of environmentally friendly vehicles configured forsubstantially replacing internal combustion engine vehicles. Theenvironmentally friendly vehicles are usually fuel cell or electricvehicles driven by electricity or a hybrid vehicle driven by an engineand a battery.

Among the environmentally friendly vehicles, the electric vehicle or thehybrid vehicle does not use a separate heater, unlike an air conditionerof a general vehicle, and the air conditioner applied to theenvironmentally friendly vehicle is referred to as a heat pump system.

On the other hand, in the case of the electric vehicle, chemicalreaction energy of oxygen and hydrogen is converted into electricalenergy to generate driving force. In the present process, since thermalenergy is generated by the chemical reaction in the fuel cell,effectively removing the generated heat is essential in securingperformance of the fuel cell.

Furthermore, even in the hybrid vehicle, a motor is driven by use of theelectricity supplied from the fuel cell or an electric battery togetherwith an engine that operates by general fuel to generate the drivingforce, and as a result, the performance of the motor may be secured onlyby effectively removing the heat generated from the fuel cell or thebattery and the motor.

As a result, in the hybrid vehicle or the electric vehicle A batterycooling system needs to be separately formed with a separate sealingcircuit together with a cooler and the heat pump system to prevent theheat generation in the motor and electrical components, and the batteryincluding the fuel cell.

Accordingly, the size and weight of a cooling module mounted in thefront of the vehicle increase and a layout of connection pipes thatsupply the refrigerant and the coolant to the heat pump system, thecooler, and the battery cooling system is complicated in an enginecompartment.

Furthermore, the battery cooling system which heats or cools the batteryaccording to a status of the vehicle for the battery to show optimalperformance is separately provided, and as a result, multiple valves forconnection with the respective connection pipes are adopted and noiseand vibration due to frequent opening/closing operations of the valvesare transferred to the interior of the vehicle to degrade ride comfort.

Furthermore, when heating the vehicle interior, there are drawbacks thatthe heating performance deteriorates due to the lack of a heat source,the electricity consumption is increased by the use of the electricheater, and the power consumption of the compressor is increased.

The information disclosed in this Background of the Invention section isonly for enhancement of understanding of the general background of theinvention and may not be taken as an acknowledgement or any form ofsuggestion that this information forms the prior art already known to aperson skilled in the art.

BRIEF SUMMARY

Various aspects of the present invention are directed to providing aheat pump system for a vehicle, which adjusts a temperature of a batterymodule by use of one chiller that performs heat exchange between arefrigerant and a coolant and improves heating efficiency by use ofwaste heat generated from an electrical component and the batterymodule.

Various aspects of the present invention are directed to providing aheat pump system for a vehicle increases the flow rate of therefrigerant by applying the gas injection unit operates in the heatingmode or the heating/dehumidification mode of the vehicle, reducing powerconsumption of the first compressor and maximizing heating performance.

Various aspects of the present invention are directed to providing theheat pump system for the vehicle, including: a cooling apparatusconfigured to include a radiator, a first water pump, a first valve, anda reservoir tank which are connected through a coolant line, andconfigured to circulate a coolant in the coolant line to cool at leastone electrical component provided in the coolant line; a battery coolingapparatus configured to include a battery coolant line connected to thereservoir tank through a second valve, and a second water pump and abattery module which are connected through the battery coolant line tocirculate the coolant in the battery module; a heating apparatusincluding a heating line connected to the coolant line through a thirdvalve to heat a vehicle interior by use of a coolant and a third waterpump provided on the heating line, and a heater; a chiller provided in abranch line which is connected to the battery coolant line through thesecond valve, and connected to a refrigerant line of an air conditionerthrough a refrigerant connection line, to adjust a temperature of thecoolant by performing heat exchange between the coolant which isselectively introduced into a connection line connecting the coolantline and the branch line through the first valve, and the branch lineand a refrigerant which is selectively supplied from the airconditioner; and a gas injection unit provided in the air conditionerand bypassing a portion of the refrigerant among the refrigerant passingthrough the condenser connected to the heating line such that thecoolant circulating the heating apparatus passed through to thecompressor to increase a flow rate of the refrigerant circulatingthrough the refrigerant line.

A first end portion of the connection line may be connected to thecoolant line through the first valve and a second end portion of theconnection line may be connected to the branch line between the secondvalve and the chiller, and the heater may be provided inside a heating,ventilation, and air conditioning (HVAC) module included in the airconditioner.

When the battery module is heated, the connection line may be open in astate in which the coolant line connected to the radiator is closedthrough operation of the first valve, the branch line may be openthrough an operation of the second valve, a portion of the batterycoolant line connected to the reservoir tank may be closed based on thebranch line, the coolant may circulate along the battery coolant lineand the branch line through an operation of the second water pump, inthe heating apparatus, the coolant line and the heating line may beconnected through operation of the third valve, in the coolingapparatus, the coolant with the temperature increased by the waste heatof the electrical component may circulate through the heating linethrough operation of the third water pump, and a high-temperaturecoolant introduced from the heating line and the coolant line may beflowed into the branch line from the coolant line through the connectionline, and may be supplied to the battery module connected through thebattery coolant line and the branch line.

The air conditioner may include: a heating, ventilation, and airconditioning (HVAC) module configured to include an evaporator which isconnected thereto through the refrigerant line and an opening andclosing door configured to control outside air passing through theevaporator to be selectively introduced into the heater depending oncooling, heating, and heating/dehumidifying modes of the vehicletherein; the condenser connected to the heating line to circulate acoolant therein to perform heat exchange between the coolant and arefrigerant supplied through the refrigerant line; a compressorconnected between the evaporator and the condenser through therefrigerant line; a heat exchanger provided on the refrigerant linebetween the condenser and the evaporator; a first expansion valveprovided in the refrigerant line between the heat exchanger and theevaporator; a second expansion valve provided in the refrigerantconnection line; an accumulator provided in the refrigerant line betweenthe evaporator and the compressor and connected to the refrigerantconnection line; and a third expansion valve provided in the refrigerantline between the condenser and the heat exchanger.

The heat exchanger may additionally condense or evaporate therefrigerant condensed in the condenser through heat exchange with theoutside air depending on the selective operation of the third expansionvalve.

The second expansion valve may expand the refrigerant inflowed throughthe refrigerant connection line to flow to the chiller when the batterymodule is cooled by use of the coolant heat-exchanged with therefrigerant.

The third expansion valve may selectively expand the refrigerantinflowed to the heat exchanger in a heating mode and aheating/dehumidification mode of the vehicle.

The gas injection unit may include: a plate-type heat exchanger providedon the refrigerant line between the condenser and the heat exchanger; abypass line having one end portion connected to the refrigerant linebetween the condenser and the plate-type heat exchanger, and the otherend portion connected to the compressor by passing through theplate-type heat exchanger; and the fourth expansion valve provided onthe bypass line at the front of the plate-type heat exchanger.

The fourth expansion valve may expand the refrigerant inflowed to thebypass line through the condenser in the heating mode or theheating/dehumidification mode of the vehicle.

The gas injection unit may include: a flash tank provided on therefrigerant line between the condenser and the heat exchanger anddividing the refrigerant passing through the condenser into a gaseousrefrigerant and a liquid refrigerant to be selectively exhausted; abypass line connecting the flash tank and the compressor, andselectively suppling the refrigerant of the gaseous state from the flashtank to the compressor; a bypass valve provided on the bypass line; anda fourth expansion valve provided on the refrigerant line between thecondenser and the flash tank.

The fourth expansion valve may expand the refrigerant passing throughthe condenser in a heating mode or heating/dehumidification mode of thevehicle.

The HVAC module may further include an air heater provided at anopposite side of the evaporator, with the heater interposed therebetweento selectively heat outside air passing through the heater, and the airheater may be operated to raise a temperature of the outside air passingthrough the heater when a temperature of a coolant supplied to theheater is lower than a target temperature for internal heating.

When the battery module is cooled in the cooling mode of the vehicle,the coolant may circulate through the coolant line by operation of thefirst water pump in the cooling apparatus; the connection line may beclosed through an operation of the first valve; in the battery coolingapparatus, the branch line may be open through an operation of thesecond valve, and the coolant passing through the chiller throughoperation of the second water pump may be supplied to the battery modulealong the battery coolant line and the branch line in a state where thebattery coolant line connected to the reservoir tank based on the branchline is closed; in the heating apparatus, the coolant line and theheating line may be connected through operation of the third valve sothat the coolant is supplied from the cooling apparatus; in the airconditioner, in a state that the refrigerant connection line is openthrough operation of the second expansion valve, the refrigerant maycirculate along the refrigerant line and the refrigerant connectionline; the first and second expansion valves may expand the refrigerantso that the expanded refrigerant is respectively supplied to theevaporator and the chiller; the third expansion valve may inflow therefrigerant supplied from the condenser to the heat exchanger; and thegas injection unit may be deactivated.

The heating apparatus may supply the coolant supplied from the coolingapparatus through operation of the third water pump to the condenser,and the condenser may condense the refrigerant through heat exchangewith the coolant, and the heat exchanger additionally condenses therefrigerant inflowed from the condenser through heat exchange with theoutside air.

When recovering the waste heat of the external heat source, theelectrical component, and the battery module in a heating mode of thevehicle, the connection line may be open through and operation of thefirst valve; in the cooling apparatus, on the basis of the connectionline, a portion of the coolant line connected to the radiator and aportion of the coolant line connecting the radiator and the reservoirtank may be closed through operation of the first valve V1, and in theinstant state, the coolant passing through the electrical component maybe supplied to the chiller along the open connection line withoutpassage through the radiator through operation of the first water pump;in the battery cooling apparatus, the branch line and the batterycoolant line may be open through operation of the second valve,respectively, and the coolant passing through the battery module may besupplied to the chiller along the branch line through operation of thesecond water pump; the coolant line and the heating line respectivelymay form an independent closed circuit through operation of the thirdvalve; in the heating apparatus, the coolant may circulate along theheating line through operation of the third water pump; in the airconditioner, the refrigerant line connecting the condenser and theevaporator may be closed through operation of the first expansion valve;the refrigerant connection line may be open through operation of thesecond expansion valve; the second expansion valve may expand therefrigerant supplied to the refrigerant connection line to be suppliedto the chiller; the third expansion valve may expand the refrigerantsupplied from the condenser to be supplied to the heat exchanger; andthe gas injection unit may be operated.

In a heating/dehumidification mode of the vehicle, the connection linemay be open through an operation of the first valve; in the coolingapparatus, on the basis of the connection line, a portion of the coolantline connected to the radiator and a portion of the coolant lineconnecting the radiator and the reservoir tank may be closed throughoperation of the first valve V1, and in the instant state, the coolantpassing through the electrical component may be supplied to the chilleralong the open connection line without passage through the radiatorthrough operation of the first water pump; in the battery coolingapparatus, the branch line may be open through an operation of thesecond valve to close the battery coolant line other than a portion ofthe battery coolant line connected to the reservoir tank with respect tothe branch line; the coolant discharged from the chiller may beintroduced into the reservoir tank through the branch line and the openthe battery coolant line; the coolant line and the heating linerespectively may form an independent closed circuit through operation ofthe third valve; in the heating apparatus, the coolant may circulatealong the heating line through operation of the third water pump; in theair conditioner, the refrigerant may be circulated along the refrigerantline and the refrigerant connection line open through operation of thefirst and second expansion valves, respectively; the first and secondexpansion valves may expand the refrigerant so that the expandedrefrigerant is respectively supplied to the evaporator and the chillerand the gas injection unit may be operated.

When cooling the electrical component and the battery module by use ofthe coolant, the connection line and the branch line may be closedthrough operation of the first and second valves, the coolant, which iscooled in the radiator and stored in the reservoir tank, may be suppliedto the electrical component through operation of the first water pump,and the coolant stored in the reservoir tank may be circulated in thebattery coolant line connected to the reservoir tank through operationof the second valve to be supplied to the battery module.

When using the waste heat of the electrical equipment in the heatingmode of the vehicle without the operation of the air conditioner, theconnection line may be open through an operation of the first valve; inthe cooling apparatus, on the basis of the connection line, a portion ofthe coolant line connected to the radiator and a portion of the coolantline connecting the radiator and the reservoir tank may be closed; thebranch line may be open through an operation of the second valve toclose the battery coolant line other than a portion of the batterycoolant line connected to the reservoir tank with respect to the branchline; the coolant whose the temperature is increased while passingthrough the electrical component by the operation of the first waterpump may be supplied to the heater along the heating line connectedthrough the third valve without passing through the radiator; thecoolant discharged from the heater may be supplied into the chilleralong the heating line, the third valve, the coolant line, theconnection line, and the branch line; and the coolant discharged fromthe chiller may be introduced into the reservoir tank through the branchline and the opened battery coolant line.

The first valve may open the coolant line connected to the radiator toallow some of the coolant passing through the electrical component toflow into the connection line and the remaining coolant to flow into theradiator when the electrical component is overheated.

The gas injection unit may be operated in the heating mode or theheating/dehumidification mode of the vehicle.

A described above, according to the heat pump system for the vehicleaccording to an exemplary embodiment of the present invention, thetemperature of the battery module may be adjusted depending on the modeof the vehicle by use of one chiller for performing heat exchangebetween the coolant and the refrigerant, and the interior of the vehiclemay be heated by use of the coolant, simplifying the entire system.

According to an exemplary embodiment of the present invention, it isalso possible to improve the heating efficiency by recovering waste heatfrom the electrical component and using it for internal heating.

Furthermore, according to an exemplary embodiment of the presentinvention, it is possible to optimize the performance of the batterymodule by efficiently controlling the temperature of the battery module,and increase an overall travel distance of the vehicle through efficientmanagement of the battery module.

Furthermore, according to an exemplary embodiment of the presentinvention can use the coolant heater applied to the heating apparatusmay be used to heat the battery module or to assist in an internalheating of the vehicle, reducing the cost and weight.

Furthermore, according to an exemplary embodiment of the presentinvention, heat of outside air, and waste heat of an electricalcomponent, and a battery module is selectively used in a heating mode ofthe vehicle, enhancing heating efficiency.

Furthermore, according to an exemplary embodiment of the presentinvention may improve the cooling performance and reducing powerconsumption of a compressor by increasing condensation or evaporationperformance of the refrigerant using a condenser and a heat exchanger.

Furthermore, according to an exemplary embodiment of the presentinvention may maximize the heating performance by applying the gasinjection unit to increase the flow rate of the refrigerant in theheating mode, or heating/dehumidification mode.

Furthermore, according to an exemplary embodiment of the presentinvention, manufacturing cost may be reduced and a weight may be reducedthrough simplification of an entire system, and spatial utilization maybe enhanced.

The methods and apparatuses of the present invention have other featuresand advantages which will be apparent from or are set forth in moredetail in the accompanying drawings, which are incorporated herein, andthe following Detailed Description, which together serve to explaincertain principles of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a block diagram of a heat pump system for a vehicleaccording to an exemplary embodiment of the present invention.

FIG. 2 illustrates a block diagram of a gas injection unit applied to aheat pump system for a vehicle according to various exemplaryembodiments of the present invention.

FIG. 3 illustrates an operational state diagram for cooling anelectrical component and a battery module using a coolant in the heatpump system for a vehicle according to an exemplary embodiment of thepresent invention.

FIG. 4 illustrates an operational state diagram for cooling a batterymodule by use of a refrigerant in a cooling mode of a vehicle in theheat pump system for a vehicle according to an exemplary embodiment ofthe present invention.

FIG. 5 illustrates an operational state diagram for waste heat recoveryof external heat, an electrical component, and a battery moduledepending on a heating mode in a heat pump system for a vehicleaccording to an exemplary embodiment of the present invention.

FIG. 6 illustrates an operational state diagram for aheating/dehumidification mode in a heat pump system for a vehicleaccording to an exemplary embodiment of the present invention.

FIG. 7 illustrates an operational state diagram for recovering andcooling waste heat of an electrical component in a heating mode of avehicle in a heat pump system for a vehicle according to an exemplaryembodiment of the present invention.

FIG. 8 illustrates an operational state diagram for heating of a batterymodule in a heat pump system for a vehicle according to an exemplaryembodiment of the present invention.

It may be understood that the appended drawings are not necessarily toscale, presenting a somewhat simplified representation of variousfeatures illustrative of the basic principles of the present invention.The specific design features of the present invention as includedherein, including, for example, specific dimensions, orientations,locations, and shapes will be determined in part by the particularlyintended application and use environment.

In the figures, reference numbers refer to the same or equivalentportions of the present invention throughout the several figures of thedrawing.

DETAILED DESCRIPTION

Reference will now be made in detail to various embodiments of thepresent invention(s), examples of which are illustrated in theaccompanying drawings and described below. While the presentinvention(s) will be described in conjunction with exemplary embodimentsof the present invention, it will be understood that the presentdescription is not intended to limit the present invention(s) to thoseexemplary embodiments. On the other hand, the present invention(s)is/are intended to cover not only the exemplary embodiments of thepresent invention, but also various alternatives, modifications,equivalents and other embodiments, which may be included within thespirit and scope of the present invention as defined by the appendedclaims.

An exemplary embodiment of the present invention will hereinafter bedescribed in detail with reference to the accompanying drawings.

Exemplary embodiments described in the exemplary embodiment andconfigurations shown in the drawings are just the most preferableexemplary embodiments of the present invention, but do not limit thespirit and scope of the present invention. Therefore, it should beunderstood that there may be various equivalents and modificationscapable of replacing them at the time of filing of the presentapplication.

To clarify the present invention, portions that are not connected withthe description will be omitted, and the same elements or equivalentsare referred to by the same reference numerals throughout thespecification.

The size and thickness of each element are arbitrarily shown in thedrawings, but the present invention is not necessarily limited thereto,and in the drawings, the thickness of layers, films, panels, regions,etc., are exaggerated for clarity.

Throughout the present specification and the claims which follow, unlessexplicitly described to the contrary, the word “comprise” or variationssuch as “comprises” or “comprising” will be understood to imply theinclusion of stated elements but not the exclusion of any otherelements.

Furthermore, the terms, “ . . . unit”, “ . . . mechanism”, “ . . .portion”, “ . . . member”, etc. used herein mean a unit of inclusivecomponents performing at least one or more functions or operations.

FIG. 1 is a block diagram of a heat pump system for a vehicle accordingto an exemplary embodiment of the present invention.

The heat pump system for the vehicle according to an exemplaryembodiment of the present invention may adjust a temperature of abattery module 24 by use of one chiller 30 in which a refrigerant and acoolant are heat-exchanged. Furthermore, the heat pump system for thevehicle according to an exemplary embodiment of the present inventionmay use waste heat of an electrical component 15 and a battery module 24and a gas injection unit 70, improving heating efficiency.

Here, in the heat pump system for the electric vehicle, a coolingapparatus 10 for cooling the electrical component 15, a battery coolingapparatus 20 for cooling the battery module 24, a heating apparatus 40heating an interior by using a coolant, and an air conditioner 50 whichis an air conditioning apparatus configured for cooling the interior maybe mutually interconnected.

That is, referring to FIG. 1, the heat pump system includes the coolingapparatus 10, the battery cooling apparatus 20, the chiller 30, and theheating apparatus 40.

First, the cooling apparatus 10 includes a radiator 12 connected to acoolant line 11, a first water pump 14, a first valve V1, and areservoir tank 16.

The radiator 12 is mounted in the front of the vehicle, and a coolingfan 13 is mounted behind the radiator 12, so that the coolant is cooledthrough an operation of the cooling fan 13 and heat exchange with theoutside air.

Furthermore, the electrical component 15 may include an electric powercontrol unit (EPCU), a motor, an inverter, or an on board charger (OBC).

The electrical component 15 configured as described above may beprovided in the coolant line 11 to be cooled in a water-cooled manner.

Accordingly, when the waste heat of the electrical component 15 isrecovered in the heating mode of the vehicle, the heat generated fromthe EPCU, the motor, the inverter, or the OBC may be recovered.

The cooling apparatus 10 may circulate the coolant in the coolant line11 such that the coolant is supplied to the electrical component 15provided in the coolant line 11.

The battery cooling apparatus 20 includes a battery coolant line 21connected to the reservoir tank 16 through a second valve V2 and asecond water pump 22 connected to the battery coolant line 21, and thebattery module 24.

The battery cooling apparatus 20 may selectively circulate the coolantin the battery module 24 through an operation of the second water pump22.

Meanwhile, the battery module 24 may be formed as a water-cooled typethat supplies power to the electrical component 15, and is cooled by acoolant flowing along the battery coolant line 31.

Herein, the first water pump 14 and the second water pump 22 may each bean electric water pump.

In the exemplary embodiment of the present invention, the chiller 30 isprovided in a branch line 31 connected to the battery coolant line 21through the second valve V2.

The chiller 30 is connected to a refrigerant line 51 of an airconditioner 50 through a refrigerant connection line 61. That is, thechiller 30 may be a water-cooled heat exchanger into which a coolantflows.

Accordingly, the chiller 30 is selectively connectable to the connectionline 35 connecting the coolant line 11 and the branch line 31 throughthe first valve V1 and to the branch line 31. The chiller 30 mayregulate the temperature of the coolant by performing heat exchangebetween the coolant and the refrigerant which is selectively suppliedfrom the air conditioner 50.

A first end portion of the connection line 35 may be connected to thecoolant line 11 via the first valve V1. A second end portion of theconnection line 35 may be connected to the branch line 31 between thesecond valve V2 and the chiller 30.

The connection line 35 may be selectively opened or closed according tothe operation of the first valve V1 and the first water pumps 14.Furthermore, the connection line 35 may connect the coolant line 11 andthe branch line 31 according to the operation of the first valve V1.

Also, the heating apparatus 40 may include a heating line 41 connectedto the coolant line 11 through a third valve V3, and a third water pump42 and a heater 52 a provided in the heating line 41 to supply thecoolant having the temperature which is increased while it passesthrough the electrical component 15 thereto.

The heater 52 a may be provided inside a heating, ventilation, and airconditioning (HVAC) module 52 included in the air conditioner 50.

Here, a coolant heater 43 to selectively heat the coolant circulating inthe heating line 41 may be provided in the heating line 41 between thethird water pump 42 and the heater 52 a.

The coolant heater 43 is ON-operated when the temperature of the coolantsupplied to the heater 52 a in the heating mode of the vehicle is lowerthan a target temperature to heat the coolant circulated in the heatingline 41, inflowing the coolant of which the temperature is increased tothe heater 52 a.

The coolant heater 43 may be an electric eater that operates accordingto the power supply.

On the other hand, in the exemplary embodiment of the present invention,it is described that the coolant heater 43 is provided in the heatingline 41, however it is not limited thereto, and an air heater 45 toincrease the temperature of the outside air inflowing to the interior ofthe vehicle may be applied instead of the coolant heater 43.

The air heater 45 may be mounted on the rear of the heater 52 a towardthe interior of the vehicle inside the HVAC module 52 to selectivelyheat the outside air passing through the heater 52 a.

That is, the heating apparatus 40 may be applied to one of the coolantheater 43 and the air heater 45.

The heating apparatus 40 constructed as described above supplies thehigh temperature coolant inflowed from the cooling apparatus 10 to theheating line 41 in the heating mode of the vehicle or the coolant ofwhich the temperature is increased while circulating through the heatingline 41 to the heater 52 a through operation of the third water pump 42,heating the vehicle interior.

Here, the first, second, and third water pumps 14, 26, and 42 may beelectric water pumps.

In the exemplary embodiment of the present invention, the airconditioner 50 includes the HVAC module 52, a condenser 53, a heatexchanger 54, a first expansion valve 55, an evaporator 56, and acompressor 59 which are connected through the refrigerant line 51.

First, the HVAC module 52 includes the evaporator 56 connected therewiththrough the refrigerant line 51, and an opening and closing door 52 bfor controlling the outside air passing through the evaporator 56 to beselectively introduced into the heater 52 a depending on cooling,heating, and heating/dehumidifying modes of the vehicle therein.

That is, the opening and closing door 52 b is opened to allow theoutside air passing through the evaporator 56 to be introduced into theheater 52 a in the heating mode of the vehicle. In contrast, in thecooling mode of the vehicle, the opening and closing door 52 b closesoff the heater 52 a such that the outside air which is cooled whilepassing through the evaporator 56 directly flows into the vehicle.

Here, when the coolant heater 43 is not provided in the heatingapparatus 40, the air heater 45 provided in the HVAC module 52 may beprovided at an opposite side of the evaporator 56 with the heater 52 ainterposed therebetween.

The air heater 45 may be operated to raise the temperature of theoutside air passing through the heater 52 a when the temperature of thecoolant supplied to the heater 52 a is lower than a target temperaturefor internal heating.

On the other hand, the air heater 45 may be provided inside the HVACmodule 52 when the coolant heater 43 is not provided in the heating line41.

That is, in the heat pump system according to an exemplary embodiment ofthe present invention, only one of the coolant heater 43 and the airheater 45 may be applied.

In the exemplary embodiment of the present invention, the condenser 53is connected to the refrigerant line 51 to allow the refrigerant to passtherethrough, and is connected to the heating line 41 to allow thecoolant circulating through the heating apparatus 40 to passtherethrough.

This condenser 53 may condense the refrigerant through heat exchangewith the coolant supplied through the heat line 41. In other words, thecondenser 53 may be a water-cooled heat exchanger into which the coolantflows.

The condenser 53 configured as described above may perform heat exchangebetween the refrigerant supplied from the compressor 59 and the coolantsupplied from the heating apparatus 40 to condense the refrigerant.

In the exemplary embodiment of the present invention, the heat exchanger54 may be provided in the refrigerant line 51 between the condenser 53and the evaporator 56.

The first expansion valve 55 is provided in the refrigerant line 51between the heat exchanger 54 and the evaporator 56. The first expansionvalve 55 receives the refrigerant passing through the heat exchanger 54to expand it.

The accumulator 57 is provided in the refrigerant line 51 between theevaporator 56 and the compressor 59 and is connected to the refrigerantconnection line 61.

Such an accumulator 57 improves the efficiency and durability of thecompressor 59 by supplying only the gaseous refrigerant to thecompressor 59.

In the exemplary embodiment of the present invention, the first endportion of the refrigerant connection line 61 is connected to therefrigerant line 51 between the heat exchanger 54 and the firstexpansion valve 55. The second end portion of the refrigerant connectionline 61 may be connected to the accumulator 57.

Here, the accumulator 55 may supply the gaseous refrigerant of therefrigerant supplied through the refrigerant connection line 61 to thecompressor 59.

On the other hand, the refrigerant connection line 61 is provided with asecond expansion valve 63, and the refrigerant line 51 between thecondenser 53 and the heat exchanger 54 may be provided with a thirdexpansion valve 65.

The second expansion valve 63 may expand the coolant inflowed throughthe refrigerant connection line 61 to inflow to the chiller 30 whencooling the battery module 24 with the refrigerant.

Here, the second expansion valve 63 is operated when recovering thewaste heat of the electrical component 15, or the battery module 26, inthe heating mode and heating/dehumidification mode of the vehicle.

The second expansion valve 63 may selectively expand the refrigerantintroduced through the refrigerant connection line 61 to inflow thechiller 30.

That is, the second expansion valve 63 expands the refrigerantdischarged from the heat exchanger 54 and flowing into the chiller 30while lowering the temperature of the refrigerant, the temperature ofthe coolant may be further lowered.

As a result, the battery module 24 may be cooled more efficiently byinflowing the coolant having the lower temperature while passing throughthe chiller 30.

The third expansion valve 65 may selectively expand the coolant which isinflowed to the heat exchanger 54 in the heating mode and theheating/dehumidification mode of the vehicle.

Here, the heat exchanger 54 may further condense or evaporate therefrigerant condensed from the condenser 53 through heat exchange withthe outside air, depending on the selective operation of the thirdexpansion valve 65.

In other words, the heat exchanger 54 is mounted in the front of theradiator 12 to mutually heat-exchange the coolant that has been inflowedtherein with the outside air.

Meanwhile, when the heat exchanger 54 condenses the refrigerant, theheat exchanger 54 may increase sub-cooling of the refrigerant by furthercondensing the refrigerant condensed at the condenser 53, improving aCOP (Coefficient Of Performance), which is a coefficient of coolingcapacity versus power required by the compressor.

The compressor 59 is connected via the refrigerant line 51 between theevaporator 58 and the condenser 53. The present compressor 59 maycompress the refrigerant in the gaseous state and supply the compressedrefrigerant to the condenser 53.

Meanwhile, in the exemplary embodiment of the present invention, theheat pump system may further include the gas injection unit 70.

The gas injection unit 70 is provided in the air conditioner 50. The gasinjection unit 70 bypasses some of the refrigerant among the refrigerantpassing through the condenser 53 to the first compressor 17, increasingthe flow rate of the refrigerant circulating through the refrigerantline 51.

The gas injection unit 70 configured as described above may operate inthe heating mode and the heating/dehumidification mode of the vehicle.

On the other hand, the gas injection unit 70 may be deactivated in thecooling mode of the vehicle.

Here, the gas injection unit 70 may include a plate-type heat exchanger71, a bypass line 73, and a fourth expansion valve 75.

First, the plate-type heat exchanger 71 may be provided on therefrigerant line 51 between the condenser 53 and the heat exchanger 54.

One end portion of the bypass line 73 is connected to the refrigerantline 51 between the condenser 53 and the plate-type heat exchanger 71.The other end portion of the bypass line 73 may be connected to thecompressor 59 by passing through the plate-type heat exchanger 71.

That is, portion of the refrigerant passing through the condenser 53 mayinflow to the bypass line 73 and the remainder of the refrigerant mayinflow to the plate-type heat exchanger 71 through the refrigerant line51.

Also, the fourth expansion valve 75 may be provided on the bypass line73 at the front of the plate-type heat exchanger 71.

The fourth expansion valve 75 may expand the refrigerant inflowed to thebypass line 73 passing through the condenser 53 in the heating mode andthe heating/dehumidification mode of the vehicle to be supplied to theplate-type heat exchanger 71.

Accordingly, the plate-type heat exchanger 71 may mutually heat-exchangethe refrigerants which is introduced into the bypass line 73 andexpanded through operation of the fourth expansion valve 75, and therefrigerant discharged from the condenser 53.

That is, the bypass line 73 may selectively supply the refrigerant ofthe gaseous state to the compressor 59 among the refrigerant whichundergoes heat transfer while passing through the plate-type heatexchanger 71.

In the gas injection unit 70 configured as described above, some of therefrigerant passing through the condenser 53 flow into the bypass line73.

The refrigerant inflowed to the bypass line 73 is expanded throughoperation of the fourth expansion valve 75, and the expanded refrigerantenters the gaseous state in the plate-type heat exchanger 71 byheat-exchanging with the remaining refrigerant inflowed through therefrigerant line 51 from the condenser 53.

The refrigerant of the gaseous state is supplied to the compressor 59through the open bypass line 73.

That is, the gas injection unit 70 again inflows the refrigerant of thegas state, which undergoes heat transfer while passing through theplate-type heat exchanger 71 to the compressor 59 through the bypassline 73, increasing the flow rate of the refrigerant circulating throughthe refrigerant line 51.

In an exemplary embodiment of the present invention, a controller isconnected to at least one of the elements of the heat pump system, tocontrol the operations thereof.

In addition, the term “controller” refers to a hardware device includinga memory and a processor configured to execute one or more stepsinterpreted as an algorithm structure. The memory stores algorithmsteps, and the processor executes the algorithm steps to perform one ormore processes of a method in accordance with various exemplaryembodiments of the present invention.

Meanwhile, a gas injection unit 170 according to various exemplaryembodiments of the present invention will be described with reference toFIG. 2.

FIG. 2 illustrates a block diagram of a gas injection unit applied to aheat pump system for a vehicle according to various exemplaryembodiments of the present invention.

Referring to FIG. 2, the gas injection unit 170 according to variousexemplary embodiments of the present invention is provided in the airconditioner 50.

The gas injection unit 170 bypasses some of the refrigerant among therefrigerant passing through the condenser 53 to the first compressor 17,increasing the flow rate of the refrigerant circulating through therefrigerant line 51.

The gas injection unit 170 configured as described above may operate inthe heating mode and the heating/dehumidification mode of the vehicle.

On the other hand, the gas injection unit 170 may be deactivated in thecooling mode of the vehicle.

Here, the gas injection unit 170 includes a flash tank 171, a bypassline 173, a bypass valve 175, and a fourth expansion valve 177.

First, the flash tank 171 may be provided on the refrigerant line 51between the condenser 53 and the heat exchanger 54.

The flash tank 171 may divide the gaseous refrigerant and the liquidrefrigerant among the refrigerant in which heat exchanged is completedwhile passing through the condensers 53 to be selectively exhausted.

The bypass line 173 connects the flash tank 171 and the compressor 59.The bypass line 173 may selectively supply the refrigerant of thegaseous state from the flash tank 171 to the compressor 59.

That is, the bypass line 173 may connect the flash tank 171 and thecompressor 59 so that the gaseous refrigerant passing through the flashtank 171 selectively inflows to the compressor 59.

In the exemplary embodiment of the present invention, the bypass valve175 is provided on the bypass line 173. The bypass valve 175 mayselectively open the bypass line 173 according to the mode of thevehicle.

Here, the flash tank 171 may supply the gaseous refrigerant to thecompressor 59 through the bypass line 173 which is opened throughoperation of the bypass valve 175. Also, the flash tank 171 may supplythe liquid refrigerant to the heat exchanger 54.

Furthermore, the fourth expansion valve 177 may be provided on therefrigerant line 51 between the condenser 53 and the flash tank 171.

Here, the fourth expansion valve 177 may expand the refrigerant passingthrough the condenser 53 in the heating mode and theheating/dehumidification mode of the vehicle to be supplied to the flashtank 171.

In the exemplary embodiment of the present invention, the first, second,and third expansion valve 55, 63, and 65, and the fourth expansion valve75 or 177 may be electronic expansion valves that selectively expand therefrigerant while controlling the flow of the refrigerant passingthrough the refrigerant line 51 or the refrigerant connection line 61 orthe bypass line 73 or 173.

Also, the first and second valves V1 and V2 may three-way valves whichmay distribute the flow, and the third valve V3 may be a four-way valve.

Hereinafter, the operation and action of the heat pump system for thevehicle according to an exemplary embodiment of the present invention isdescribed with reference to FIG. 3 to FIG. 8 in detail.

First, the operation of the heat pump system for the vehicle accordingto an exemplary embodiment of the present invention is described withreference to FIG. 3 when cooling the electrical component 15 and thebattery module 24 by use of the coolant.

FIG. 3 illustrates an operational state diagram for cooling anelectrical component and a battery module using a coolant in the heatpump system for a vehicle according to an exemplary embodiment of thepresent invention.

Referring to FIG. 3, the branch line 31 and the connection line 35 areclosed through operations of the first and second valves V1 and V2.

Furthermore, the battery coolant line 21 is connected to the reservoirtank 16 through operation of the second valve V2.

In the present state, in the cooling apparatus 10, the first water pump14 is operated to cool the electrical component 15. Accordingly, thecoolant which is cooled in the radiator 12 and stored in the reservoirtank 16 is supplied to the electrical component 15.

In the battery cooling apparatus 20, the second water pump 22 isoperated to cool the battery module 24.

Accordingly, the coolant stored in the reservoir tank 16 is supplied tothe battery module 24, while circulating through the battery coolantline 21 connected to the reservoir tank 16 by the operation of thesecond valve V2.

That is, the coolant cooled in the radiator 12 and stored in thereservoir tank 16 circulates through the coolant line 11 and the batterycoolant line 21 by the operations of the first and second water pumps 14and 22, respectively, to efficiently cool the electrical component 15and the battery module 24.

The air conditioner 50 and the gas injection unit 70 are not operatedbecause the cooling mode of the vehicle is not activated.

On the other hand, although it has been described in the exemplaryembodiment of the present invention that both of the electricalcomponent 15 and the battery module 24 are cooled, the present inventionis not limited thereto, and when one of the electrical component 15 andthe battery module 24 is separately cooled, the first and second waterpumps 14 and 22 may be selectively operated.

An operation of the case of cooling the battery module 24 in the coolingmode of the vehicle will be described with respect to FIG. 43.

FIG. 4 illustrates an operational state diagram for cooling a batterymodule by use of a refrigerant in a cooling mode of a vehicle in theheat pump system for a vehicle according to an exemplary embodiment ofthe present invention.

Referring to FIG. 4, in the cooling apparatus 10, the coolant iscirculated in the coolant line 11 through operation of the first waterpump 14. Accordingly, the coolant cooled by the radiator 12 iscirculated to the electrical component 15.

Herein, the first connection line 33 is closed through operation of thefirst valve V1.

In the heating apparatus 40, the coolant line 11 and the heating line 41are connected through operation of the third valve V3 such that thecoolant supplied from the cooling apparatus 11 is circulated.

Thus, the coolant cooled by the radiator 12 may be supplied to thecondenser 53 through operation of the first and third water pumps 14 and42.

In the battery cooling apparatus 20, the branch line 31 is openedthrough operation of the second valve V2. A portion of the batterycoolant line 21 connected to the reservoir tank 16 is closed on thebasis of the branch line 31.

In the present state, the coolant having passed through the chiller 30may be supplied to the battery module 24 while it circulates along thebranch line 31 and the battery coolant line 21 connected to the branchline 31 without passing through the reservoir tank 16 through operationof the second water pump 22.

That is, in the battery cooling apparatus 20, a closed circuit throughwhich the coolant independently circulates may be formed by connectingthe opened branch line 31 with the battery coolant line 21 in a statewhere the connection with the connection of the reservoir tank 16 isclosed through operation of the second valve V2.

In the air conditioner 50, each constituent element operates to cool theinterior of the vehicle. Accordingly, the refrigerant is circulatedalong the refrigerant line 51.

Herein, the refrigerant line 51 connecting the heat exchanger 54 and theevaporator 56 is opened through operation of the first expansion valve55. The refrigerant connection line 61 is opened through operation ofthe second expansion valve 63.

Accordingly, the refrigerant having passed through the heat exchanger 54may be circulated along the refrigerant line 51 and the refrigerantconnection line 61.

Herein, the first and second expansion valves 55 and 63 may expand therefrigerant such that the expanded refrigerant is supplied to theevaporator 56 and the chiller 40, respectively. The third expansionvalve 65 may inflow the refrigerant supplied from the condenser 53 tothe heat exchanger 54 without expanding.

Meanwhile, the heating apparatus 40 supplies the coolant supplied fromthe cooling apparatus 10 to the condenser 53 through operation of thethird water pump 42.

Accordingly, the condenser 53 condenses the coolant using the coolantflowing along the heating line 41. Also, the heat exchanger 54 mayadditionally condense the refrigerant inflowed from the condenser 53through operation of the third expansion valve 65 through heat exchangewith the outside air.

The coolant passing through the chiller 30 is circulated in the batterycoolant line 21 and the first branch line 31 without passing through thereservoir tank 16 to cool the battery module through operation of thesecond water pump 22.

The coolant passing through the chiller 30 is cooled through heatexchange with the expanded refrigerant which is supplied to the chiller30. The coolant cooled in the chiller 30 is supplied to the batterymodule 24. Accordingly, the battery module 24 is cooled by the cooledcoolant.

That is, the second expansion valve 63 expands some of the coolantthrough the sub-condenser 54 to supply the expanded refrigerant to thechiller 30, and opens the refrigerant connection line 61.

Accordingly, the refrigerant discharged from the heat exchanger 54 isexpanded to enter a low-temperature and low-pressure state throughoperation of the second expansion valve 63, and flows into the chiller30 connected to the refrigerant connection line 61.

Then the refrigerant inflowed to the chiller 30 undergoes heat transferwith the coolant and then inflows to the compressor 59 after passingthrough the accumulator 57 through the refrigerant connection line 61.

In other words, the coolant with the increased temperature from coolingthe battery module 24 is cooled through heat exchange inside the chiller30 with the low temperature low pressure refrigerant. The cooled coolantis again supplied to the battery module 24 through the battery coolantline 21 and the branch line 31.

That is, the coolant may efficiently cool the battery module 24 whilerepeating the above-described operation.

Meanwhile, the remaining coolant exhausted from the heat exchanger 54flows through the refrigerant line 51 to cool the interior of thevehicle, and sequentially passes through the first expansion valve 55,the evaporator 56, the compressor 59, and the condenser 53.

Here, the outside air which is inflowed to the HVAC module 52 is cooledby the low temperature refrigerant inflowed to the evaporator 56 whilepassing through the evaporator 56.

At the present time, the door 52 b reduces a portion of the cooledoutside air passing through the heater 52 a to not pass through theheater 52 a. Thus, the cooled outside air may be directly directed intothe interior of the vehicle, cooling the interior of the vehicle.

On the other hand, in the evaporator 56, the refrigerant of which thecondensed amount is increased while sequentially passing through thecondenser 53 and the heat exchanger 54 is expanded and supplied,evaporating the refrigerant with the further lower temperature.

That is, in the exemplary embodiment of the present invention, thecondenser 53 condenses the refrigerant, and the heat exchanger 54further condenses the refrigerant, favoring the subcooling formation ofthe refrigerant.

As the subcooled refrigerant evaporates with the lower temperature inthe evaporator 56, the temperature of the air which is heat exchanged atthe evaporator 56 may be further reduced, improving cooling performanceand efficiency.

On the other hand, the gas injection unit 70 is deactivated.

While repeating the above-described process, the refrigerant may coolthe interior of the vehicle in the cooling mode and simultaneously coolthe coolant through the heat exchange while passing through the chiller30.

The coolant of a low temperature cooled by the chiller 30 inflows to thebattery module 24. Accordingly, the battery module 24 may be efficientlycooled by the supplied low temperature coolant.

In the exemplary embodiment of the present invention, the operation forthe case of recovering the waste heat of the external heat source, theelectrical component 15, and the battery module 24 in the heating modeof the vehicle is described with reference to FIG. 5.

FIG. 5 illustrates an operational state diagram for waste heat recoveryof external heat, an electrical component, and a battery moduledepending on a heating mode in a heat pump system for a vehicleaccording to an exemplary embodiment of the present invention.

Referring to FIG. 5, the heat pump system may absorb the external heatair along with the waste heat of the electrical component 15 and thebattery module 24 in an initial starting idle state IDLE of the vehicleor in a during initial driving state where the waste heat of theelectrical component 15 is insufficient.

First, in the cooling apparatus 10, the first water pump 14 is operatedfor circulation of the coolant.

Herein, the connection line 35 is opened through operation of the firstvalve V1. At the same time, on the basis of the connection line 35, aportion of the coolant line 11 connected to the radiator 12 and aportion of the coolant line 11 connecting the radiator 12 and thereservoir tank 16 are closed through operation of the first valve V1.

In the present state, the coolant passing through the electricalcomponent 15 may be supplied to the chiller 30 along the openedconnection line 35 without passage through the radiator 12 throughoperation of the first water pump 14.

Meanwhile, in the battery cooling apparatus 20, the branch line 31 andthe battery coolant line 21 are opened through operation of the secondvalve V2, respectively. The coolant passing through the battery module24 may be supplied to the chiller 30 along the branch line 31 throughoperation of the second water pump 22.

That is, in the cooling apparatus 10, the coolant line 11 is connectedto the branch line 31 through the opened the connection line 35. In thebattery cooling apparatus 20, on the basis of the branch line 31, aportion of the battery coolant line 21 connected to the battery module24 and a portion of the battery coolant line 21 connected to thereservoir tank 16 are connected to the branch line 31, respectively.

Thus, the coolant passing through the electrical component 15continuously circulates along the coolant line 11, the connection lines35, and the branch line 31 without passing through the radiator 12, andabsorbs the waste heat from the electrical component 15 such that thetemperature is increased.

Furthermore, the coolant passing through the battery module 24continuously circulates along the battery coolant line 21 and the branchline 31, and absorbs the waste heat from the battery module 24 such thatthe temperature is increased.

The coolant with the increased temperature may be supplied to thechiller 30 provided at the branch line 31. That is, the waste heatgenerated by the electrical component 15 and the battery module 24raises the temperature of the coolant circulating through the coolantline 11 and the battery coolant line 21, respectively.

In the heating apparatus 40, the coolant circulates along the heatingline 41 through operation of the third water pump 42.

The coolant line 11 and the heating line 41 may form the independentclosed circuit through operation of the third valve V3.

Thus, the coolant circulating through the heating line 41 may besupplied to the condenser 53 after passing through the heater 52 athrough operation of the third water pump 42.

Here, the coolant heater 43 is operated when the temperature of thecoolant circulating along the heating line 41 is lower than the targettemperature, so that the coolant circulating in the heating line 41 maybe heated.

On the other hand, when the air heater 45 is applied instead of thecoolant heater 43, the air heater 45 operates when the temperature ofthe outside air passing through the heater 52 a is lower than the targettemperature, and the outside air inflowed to the interior of the vehiclemay be heated.

In the air conditioner 50, each constituent element operates to heat thevehicle interior. Thus, the refrigerant circulates along the refrigerantline 51. Furthermore, the gas injection unit 70 is operated.

Here, the refrigerant line 51 connecting the condenser 53 and theevaporator 56 is closed through operation of the first expansion valve55.

The refrigerant connection line 61 is opened through operation of thesecond expansion valve 63.

Here, the second expansion valve 63 may supply the refrigerant to thechiller 30 by expanding the refrigerant supplied from the heat exchanger54 to the refrigerant connection line 61.

The third expansion valve 65 may also supply the refrigerant to the heatexchanger 54 by expanding the refrigerant supplied from the condenser53.

Thus, the heat exchanger 54 recovers the external heat while evaporatingthe expanded refrigerant through heat exchange with the outside air.

The coolant, which absorbs the waste heat of the electrical component 15and the battery module 24 and is increased in temperature, is recoveredby increasing the temperature of the refrigerant supplied to the chiller30 while passing through the chiller 30 through operation of the firstand second water pumps 14 and 22.

That is, the chiller 30 receives the refrigerant supplied from the heatexchanger 54 and expanded through operation of the second expansionvalve 63 through the refrigerant connection line 61, and evaporates thesupplied refrigerant through heat exchange with the coolant of which thetemperature is increased while passing through the electrical component15 and the battery module 24, respectively, recovering the waste heat ofthe electrical component 15 and the battery module 24.

Next, the refrigerant passing through the chiller 30 is supplied to theaccumulator 57 along the refrigerant connection line 61.

The refrigerant supplied to the accumulator 57 is separated into gas andliquid. Of the refrigerant separated by gas and liquid, the gaseousrefrigerant is supplied to the compressor 59.

The refrigerant compressed with the high temperature high pressure fromthe compressor 59 inflows to the condenser 53.

Here, the refrigerant supplied to the condenser 53 may increase thetemperature of the coolant by exchanging heat with the coolantcirculating through the heating line 41. The coolant with raisedtemperature is supplied to the heater 52 a.

Meanwhile, the door 52 b is opened so that the outside air inflowed tothe HVAC module 52 and passing through the evaporator 56 passes throughthe heater 52 a.

As a result, the outside air inflow from the outside flows into theinterior in an uncooled temperature state when passing through theevaporator 56, which is not supplied with the refrigerant. The inflowedoutside air is converted to a high temperature state while passingthrough the heater 52 a to be inflowed into the interior of the vehicle,realizing the heating of the interior of the vehicle.

On the other hand, when the gas injection unit 70 is operated, some ofthe refrigerant passing through the condenser 53 is flowed into thebypass line 73.

The refrigerant inflowed to the bypass line 73 is flowed into theplate-type heat exchanger 71 in the expanded state through operation ofthe fourth expansion valve 75.

The expanded refrigerant inflowed through the bypass line 73 enters thegaseous state in the plate-type heat exchanger 71 by heat-exchangingwith the remaining refrigerant inflowed through the refrigerant line 51from the condenser 53.

The refrigerant of the gaseous state is supplied to the compressor 59through the opened bypass line 73.

That is, the gas injection unit 70 again inflows the refrigerant of thegas state, which undergoes heat transfer while passing through theplate-type heat exchanger 71 to the compressor 59 through the bypassline 73, increasing the flow rate of the refrigerant circulating throughthe refrigerant line 51.

Also, the refrigerant discharged through the refrigerant line 51 fromthe plate-type heat exchanger 71 is flowed into the heat exchanger 54along the refrigerant line 51 which is open through operation of thethird expansion valve 65.

That is, in the gas injection unit 70, the plate-type heat exchanger 71may mutually heat-exchange the refrigerant inflowed through the bypassline 73 and the refrigerant inflowed through the refrigerant line 51.And the plate-type heat exchanger 71 bypass the refrigerant of thegaseous state to the compressor 59 through the bypass line 73.

The refrigerant may then be further condensed through heat exchange withthe outside air in the heat exchanger 54, increasing the condensationamount of the first refrigerant.

The refrigerant with the increased condensation amount may smoothlyrecover the waste heat from the coolant of which the temperature isincreased while passing through the electrical component 15 and thebattery module 24 in the chiller 30, improving the heating performanceand the efficiency.

That is, the heat pump system according to the exemplary embodiment ofthe present invention absorbs the external heat from the heat exchanger54 when the heating is required in the initial starting idle state(IDLE) of the vehicle or the during initial driving state and is used toincrease the temperature of the refrigerant by use of the waste heat ofthe electrical component 15 and the battery module 24, reducing thepower consumption of the compressor 59 and improving the heatingefficiency.

Furthermore, the present invention may improve heating efficiency andperformance while minimizing the use amount of separate electric heater.

Furthermore, the gas injection unit 70 increases the flow rate of therefrigerant, maximizing heating performance.

Meanwhile, in the exemplary embodiment of the present invention, thewaste heat of the electrical component 15 and the battery module 24 arerecovered together as an exemplary embodiment of the present invention,but the exemplary embodiment is not limited thereto, and the waste heatof the battery module 24 may be selectively recovered.

That is, when the waste heat of the battery module 24 is not recovered,in the battery cooling apparatus 20, a remaining of the battery coolantline 21 is closed except for a portion of the battery coolant line 21connected to the reservoir tank 16 based on the branch line 31, and theoperation of the second water pump 22 may be stopped.

In the exemplary embodiment of the present invention, the operation forthe case of recovering the waste heat of the electrical component 15depending on the heating/dehumidification mode of the vehicle isdescribed with reference to FIG. 6.

FIG. 6 illustrates an operational state diagram for aheating/dehumidification mode in a heat pump system for a vehicleaccording to an exemplary embodiment of the present invention.

Referring to FIG. 6, the heat pump system may recover the waste heat ofthe electrical component 15 in the heating/dehumidification mode of thevehicle to use the internal heating.

Here, when the temperature of the vehicle interior is a low temperature,the heat pump system may recover the external heat along with the wasteheat of the electrical component 15. Whereas, when the temperature ofthe vehicle interior is a high temperature, it may only recover thewaste heat of the electrical component 15 to use in the internal heatingof the vehicle.

First, in the cooling apparatus 10, the first water pump 14 is operatedfor circulation of the coolant.

Herein, the connection line 35 is opened through operation of the firstvalve V1. At the same time, on the basis of the connection line 35, aportion of the coolant line 11 connected to the radiator 12 and aportion of the coolant line 11 connecting the radiator 12 and thereservoir tank 16 are closed through operation of the first valve V1.

In the present state, the coolant passing through the electricalcomponent 15 may be supplied to the chiller 30 along the openedconnection line 35 without passage through the radiator 12 throughoperation of the first water pump 14.

Meanwhile, in the battery cooling apparatus 20, the branch line 31 isopened through operation of the second valve V2, and a remaining of thebattery coolant line 21 is closed except for a portion of the batterycoolant line 21 connected to the reservoir tank 16 based on the branchline 31.

That is, the battery coolant line 21 connecting the second water pump 22and the battery module 24 is closed, and the operation of the secondwater pump 22 is stopped.

In the present state, the coolant passing through the electricalcomponent 15 is continuously circulated along the coolant line 11, theconnection line 35, and the branch line 31 without the passage throughthe radiator 12, and absorbs the waste heat from the electricalcomponent 15 such that the temperature is increased.

The coolant with the increased temperature may be supplied to thechiller 30 provided at the branch line 31.

The coolant discharged from the chiller 30 is introduced into thereservoir tank 16 through the branch line 31 and the opened batterycoolant line 21. Accordingly, the coolant passes through the electricalappliance 15 along the coolant line 11 from the reservoir tank 16through operation of the first water pump 14, may flow into theconnection line 35.

That is, the waste heat generated by the electrical component 15 raisesthe temperature of the coolant circulating through the coolant line 11,the connection line 35, the branch line 31, and the opened batterycoolant line 21.

In the heating apparatus 40, the coolant circulates along the heatingline 41 through operation of the third water pump 42.

The coolant line 11 and the heating line 41 may form the independentclosed circuit through operation of the third valve V3.

Thus, the coolant circulating through the heating line 41 may besupplied to the condenser 53 after passing through the heater 52 athrough operation of the third water pump 42.

Here, the coolant heater 43 is operated when the temperature of thecoolant circulating along the heating line 41 is lower than the targettemperature, so that the coolant circulating in the heating line 41 maybe heated.

On the other hand, when the air heater 45 is applied instead of thecoolant heater 43, the air heater 45 operates when the temperature ofthe outside air passing through the heater 52 a is lower than the targettemperature, and the outside air inflowed to the interior of the vehiclemay be heated.

In the air conditioner 50, each constituent element operates to heat thevehicle interior. Thus, the refrigerant circulates along the refrigerantline 51. Furthermore, the gas injection unit 70 is operated.

Here, the refrigerant line 51 connecting the condenser 53 and theevaporator 56 is opened through operation of the first expansion valve55.

The refrigerant connection line 61 is opened through operation of thesecond expansion valve 63.

Here, the first and second expansion valves 55 and 63 may expand therefrigerant supplied to the refrigerant connection line 61 and therefrigerant line 51 from the heat exchanger 54 so that the expandedrefrigerant is supplied to the evaporator 56 and the chiller 30.

Furthermore, when the temperature of the vehicle interior is low, thethird expansion valve 65 may expand the refrigerant supplied from thecondenser 53 to be inflowed to the heat exchanger 54.

Accordingly, the heat exchanger 54 recovers the external heat whileevaporating the expanded refrigerant through the heat exchange with theoutside air.

Conversely, the third expansion valve 65 may inflow the refrigerantsupplied from the condenser 53 to the heat exchanger 54 withoutexpanding when the temperature of the vehicle interior is high.

Accordingly, the heat exchanger 54 may condense the refrigerant throughheat exchange with the outside air.

Also, the coolant of which the temperature is increased by absorbing thewaste heat of the electrical component 15 is recovered while increasingthe temperature of the refrigerant supplied to the chiller 30 whilepassing through the chiller 30 through operation of the first water pump14.

That is, the chiller 30 receives the refrigerant supplied from the heatexchanger 54 and expanded through operation of the second expansionvalve 63 through the refrigerant connection line 61, and evaporates thesupplied refrigerant through heat exchange with the coolant of which thetemperature is increased while passing through the electrical component15, recovering the waste heat of the electrical component 15.

Next, the refrigerant passing through the chiller 30 is supplied to theaccumulator 57 along the refrigerant connection line 61.

The refrigerant supplied to the accumulator 57 is separated into gas andliquid. Of the refrigerant separated by gas and liquid, the gaseousrefrigerant is supplied to the compressor 59.

The refrigerant compressed from the compressor 59 with the hightemperature high pressure inflows to the condenser 53.

Here, the refrigerant supplied to the condenser 53 may increase thetemperature of the coolant by exchanging heat with the coolantcirculating through the heating line 41. The coolant with raisedtemperature is supplied to the heater 52 a.

On the other hand, the expanded refrigerant supplied to the evaporator56 though the operation of the first expansion valve 55 exchanges heatwith the outside air passing through the evaporator 56, and is thensupplied to the compressor 59 through the accumulator 57 along therefrigerant line 51.

That is, the refrigerant passing through the evaporator 56 may besupplied to the compressor 59 along with the refrigerant inflowed to theaccumulator 57 through the refrigerant connection line 61.

The refrigerant compressed by the compressor 59 with high temperatureand high pressure is then inflowed to the condenser 53.

Here, the door 52 b is opened so that the outside air inflowed to theHVAC module 52 and passing through the evaporator 56 passes through theheater 52 a.

That is, the outside air inflowed to the HVAC module 52 is dehumidifiedwhile passing through the evaporator 56 by the refrigerant of the lowtemperature state inflowed to the evaporator 56. Next, the outside airis converted into a high temperature state while passing through theheater 52 a and inflowing to the vehicle interior, heating anddehumidifying the interior of the vehicle.

On the other hand, when the gas injection unit 70 is operated, some ofthe refrigerant passing through the condenser 53 is flowed into thebypass line 73.

The refrigerant inflowed to the bypass line 73 is flowed into theplate-type heat exchanger 71 in the expanded state through operation ofthe fourth expansion valve 75.

The expanded refrigerant inflowed through the bypass line 73 enters thegaseous state in the plate-type heat exchanger 71 by heat-exchangingwith the remaining refrigerant inflowed through the refrigerant line 51from the condenser 53.

The refrigerant of the gaseous state is supplied to the compressor 59through the opened bypass line 73.

That is, the gas injection unit 70 again inflows the refrigerant of thegas state, which undergoes heat transfer while passing through theplate-type heat exchanger 71 to the compressor 59 through the bypassline 73, increasing the flow rate of the refrigerant circulating throughthe refrigerant line 51.

Also, the refrigerant discharged through the refrigerant line 51 fromthe plate-type heat exchanger 71 is flowed into the heat exchanger 54along the refrigerant line 51 which is opened through operation of thethird expansion valve 65.

That is, in the gas injection unit 70, the plate-type heat exchanger 71may mutually heat-exchange the refrigerant inflowed through the bypassline 73 and the refrigerant inflowed through the refrigerant line 51.And the plate-type heat exchanger 71 bypass the refrigerant of thegaseous state to the compressor 59 through the bypass line 73.

The refrigerant may then be further condensed through heat exchange withthe outside air in the heat exchanger 54, increasing the condensationamount of the first refrigerant.

The refrigerant with the increased condensation amount may smoothlyrecover the waste heat from the coolant of which the temperature isincreased while passing through the electrical component 15 and thebattery module 24 in the chiller 30, improving the heating performanceand the efficiency.

That is, the heat pump system according to the exemplary embodiment ofthe present invention selectively absorbs the external heat depending onthe internal temperature of the vehicle along with the waste heatgenerated from the electrical component 15 in theheating/dehumidification mode of the vehicle by being used to increasethe temperature of the refrigerant, reducing the power consumption ofthe compressor 59 and improving the heating efficiency.

Furthermore, the gas injection unit 70 increases the flow rate of therefrigerant, maximizing heating performance.

In the exemplary embodiment of the present invention, the operation forthe case of using the waste heat of the electrical equipment 15 in theheating mode of the vehicle without the operation of the air conditioner50 is described with reference to FIG. 7.

FIG. 7 illustrates an operational state diagram for recovering andcooling waste heat of an electrical component in a heating mode of avehicle in a heat pump system for a vehicle according to an exemplaryembodiment of the present invention.

Referring to FIG. 7, the heat management system may recover the wasteheat of the electric component 15 and use it for heating the interior ofthe vehicle.

First, in the cooling apparatus 10, the first water pump 14 is operatedfor circulation of the coolant. In the instant case, the air conditioner50 and the gas injection unit 70 are deactivated.

Herein, the connection line 35 is opened through operation of the firstvalve V.

Accordingly, in the cooling apparatus 10, on the basis of the connectionline 35, a portion of the coolant line 11 connected to the radiator 12and a portion of the coolant line 11 connecting the radiator 12 and thereservoir tank 16 are closed through operation of the first valve V1.

The branch line 31 is opened through operation of the second valve V1 toclose the battery coolant line 21 other than a portion of the batterycooling water line 21 connected to the reservoir tank 16 with respect tothe branch line 31.

That is, the battery coolant line 21 connecting the second water pump 22and the battery module 24 is closed, and the operation of the secondwater pump 22 is stopped.

In the present state, the coolant whose the temperature is increasedwhile passing through the electrical component 15 by the operation ofthe first water pump 14 is supplied to the heater 52 a along the heatingline 41 connected through the third valve V3 without passing through theradiator 12.

Here, the coolant introduced into the heating line 41 passes through theheater 52 a by the operation of the third water pump 42. At the instanttime, the coolant heater 43 is operated when the temperature of thecoolant circulating along the heating line 41 is lower than the targettemperature, so that the coolant circulating in the heating line 41 maybe heated.

On the other hand, when the air heater 45 is applied instead of thecoolant heater 43, the air heater 45 may be selectively operateddepending on the temperature of the outside air passing through theheater 52 a.

The air heater 45 may be operated when the temperature of the outsideair passing through the heater 52 a is lower than a target temperature,heating the outside air flowing into the interior of the vehicle.

The air heater 45 is operated when the temperature of the outside airthat has completed heat exchange with the high-temperature coolant whilepassing through the heater 52 a is lower than a predeterminedtemperature or a target heating temperature.

As a result, when the air heater 45 is operated, the outside air may beheated while passing through the air heater 45, to be introduced intothe vehicle interior in a state where the temperature is raised.

In the exemplary embodiment of the present invention, the coolantdischarged from the heater 52 a is introduced into the coolant line 11via the heating line 41 and the third valve V3, and then is suppliedinto the chiller 30 along the connection line 35 and the branch line 31.

Here, since the coolant supplied to the chiller 30 does not flow intothe chiller 30, the coolant 30 may pass through the chiller 30 withoutheat exchange with the refrigerant.

The coolant discharged from the chiller 30 passes through the branchline 31 and the opened battery coolant line 21 sequentially, andintroduces into the reservoir tank 16 again.

That is, the coolant that has passed through the electrical component 15continues to circulate along the coolant line 11, the heating line 41,the connection line 35, the branch line 31, and a portion of the batterycoolant line 21 without passing through the radiator 12, and absorbs thewaste heat from the electric component 15, such that the temperaturethereof increases.

The coolant having the temperature that has been raised is introducedinto the heating line 41 connected to the coolant line 11 throughoperation of the third valve V3. Accordingly, the high-temperaturecoolant introduced into the heating line 41 is supplied to the heater 52a.

Herein, the opening and closing door 52 b is opened such that theoutside air flowing into the HVAC module 52 passes through the heater 52a.

Accordingly, the outside air introduced from the outside flows in a roomtemperature state in which it is not cooled when passing through theevaporator 56 to which no refrigerant is supplied. The introducedoutside air may be converted into a high temperature state while passingthrough the heater 52 a, and flows into the vehicle, heating theinterior of the vehicle.

In other words, according to an exemplary embodiment of the presentinvention, it is possible to recover the waste heat generated in theelectrical component 15 while repeating the above-described process, anduse the waste heat for internal heating, reducing power consumption andimproving overall heating efficiency.

On the other hand, in a process of heating the interior of the vehicleby recovering the waste heat of the electrical component 15 using thecoolant, when the electrical component 15 is overheated, a portion ofthe coolant line 11 connected to the radiator 12, and a portion of thecoolant line 11 connecting the radiator 12 and the reservoir tank 16 areopen through operation of the first valve V1.

Accordingly, the remaining coolant, which is not supplied to the heater52 a, is cooled through the radiator 12.

The coolant that has been completely cooled may recover waste heat whilepassing through the electrical component 15, and at the same time, mayefficiently cool the electrical component 15, together with the coolantintroduced into the reservoir tank 16 through the connection line 35,the branch line 31, and a portion of the battery coolant line 21.

When the electrical component 15 is overheated, the first valve V1 mayopen the coolant line 11 connected to the radiator 12 to allow some ofthe coolant passing through the electrical component 15 to flow into theconnection line 35 and the remaining coolant to flow into the radiator12.

As a result, some coolant cooled in the radiator 12 may be supplied tothe electrical component 15, preventing the electrical component 15 fromoverheating.

Therefore, according to an exemplary embodiment of the presentinvention, it is possible to recover the waste heat generated in theelectrical component 15, and use the waste heat for internal heating,reducing power consumption and improving overall heating efficiency.

At the same time, according to an exemplary embodiment of the presentinvention, some coolant may be introduced into the radiator 12 throughoperation control of the first valve V1 configured for distributing theflow, to be cooled, and then be supplied to the electrical component 15,efficiently cooling the electrical component 15 and ensuring the coolingperformance of the electrical component 15.

An operation of the case of heating the battery module 26 will bedescribed with respect to FIG. 8.

FIG. 8 illustrates an operational state diagram for heating of a batterymodule in a heat pump system for a vehicle according to an exemplaryembodiment of the present invention.

Referring to FIG. 8, the heat pump system may heat the battery module 26by recovering the waste heat of the electrical component 15.

First, the connection line 35 is opened in the cooling device 10 in astate in which the coolant line 11 connected to the radiator 12 isclosed through operation of the first valve V1. In the instant case, theair conditioner 50 and the gas injection unit 70 are deactivated.

The branch line 31 is opened through operation of the second valve V2.Accordingly, a remaining of the battery coolant line 21 is opened exceptfor a portion of the battery coolant line 21 connected to the reservoirtank 16 based on the branch line 31.

As a result, the battery coolant line 21 connected to the reservoir tank16 is closed, and the remaining battery coolant line 21 connected to thebattery module 24 may be opened.

That is, the battery coolant line 21 connecting the second water pump 22and the battery module 24 in the battery cooling apparatus 20 is open tobe connected to the branch line 31.

Accordingly, in the battery cooling apparatus 20, the coolant iscirculated along the opened battery coolant line 21 and the branch line31 through operation of the second water pump 22.

Some of the coolant passing through the battery module 24 may beintroduced into the reservoir tank 16 connected through the second valveV2, and the remaining coolant may flow into the branch line 31.

Meanwhile, in the heating apparatus 40, the coolant line 11 and theheating line 41 are connected through operation of the third valve V3.

In the present state, the coolant whose the temperature is increasedwhile passing through the electrical component 15 by the operation ofthe first water pump 14 is flowed to the heating line 41 connectedthrough the third valve V3 without passing through the radiator 12.

That is, the coolant with the increased temperature by the waste heat ofthe electrical component 15 in the cooling apparatus 11 may circulatethrough the heating line 41 through operation of the third water pumpV3.

Herein, the coolant heater 43 is operated to heat the coolant when thetemperature of the coolant circulating along the heating line 41 islower than the target temperature. Accordingly, the coolant circulatingin the heating line 41 rises in temperature as it passes through thecoolant heater 43.

Accordingly, the coolant having an increased temperature while passingthrough the coolant heater 43, is flowed into the coolant line 11 fromthe heating line 41 through the third valve V3. Accordingly, thehigh-temperature coolant is introduced into the branch line 31 from thecoolant line 11 through the connection line 31.

The high-temperature coolant introduced into the branch line 31 may besupplied to the battery module 24 connected through the battery coolantline 21 and the branch line 31.

As a result, the high-temperature coolant may raise the temperature ofthe battery module 24.

As a result, according to an exemplary embodiment of the presentinvention, it is possible to rapidly increase the temperature of thebattery module 24 while repeating the above-described process,efficiently managing the temperature of the battery module 24.

Thus, if the heat pump system for the vehicle according to an exemplaryembodiment of the present invention as described above is applied, thetemperature of the battery module 24 may be adjusted depending on themode of the vehicle by use of one chiller 30 for performing heatexchange between the coolant and the refrigerant, and the interior ofthe vehicle may be heated by use of the coolant, simplifying the entiresystem.

According to an exemplary embodiment of the present invention, it isalso possible to improve the heating efficiency by recovering waste heatfrom the electrical component 15 and using it for internal heating.

Furthermore, according to an exemplary embodiment of the presentinvention, it is possible to optimize the performance of the batterymodule 24 by efficiently controlling the temperature of the batterymodule 24, and increase an overall travel distance of the vehiclethrough efficient management of the battery module 24.

Furthermore, the present invention may use the coolant heater 43 appliedto the heating apparatus 40 to heat the battery module 24 or to assistin an internal heating of the vehicle, reducing the cost and weight.

Furthermore, the present invention selectively utilizes the externalheat and the waste heat of the electrical component 15 and the batterymodule 24 in the heating mode of the vehicle, improving the heatingefficiency.

The present invention also improves the condensing or evaporationperformance of the refrigerant by use of the condenser 53 and the heatexchanger 54, improving the cooling performance and reducing the powerconsumption of the compressor 59.

Furthermore, the present invention may maximize the heating performanceby applying the gas injection unit 70 to increase the flow rate of therefrigerant in the heating mode, or heating/dehumidification mode.

Furthermore, the present invention may reduce production cost and weightand improve space utilization by simplifying the entire system.

For convenience in explanation and accurate definition in the appendedclaims, the terms “upper”, “lower”, “inner”, “outer”, “up”, “down”,“upwards”, “downwards”, “front”, “rear”, “back”, “inside”, “outside”,“inwardly”, “outwardly”, “internal”, “external”, “inner”, “outer”,“forwards”, and “backwards” are used to describe features of theexemplary embodiments with reference to the positions of such featuresas displayed in the figures. It will be further understood that the term“connect” or its derivatives refer both to direct and indirectconnection.

The foregoing descriptions of specific exemplary embodiments of thepresent invention have been presented for purposes of illustration anddescription. They are not intended to be exhaustive or to limit thepresent invention to the precise forms disclosed, and obviously manymodifications and variations are possible in light of the aboveteachings. The exemplary embodiments were chosen and described toexplain certain principles of the present invention and their practicalapplication, to enable others skilled in the art to make and utilizevarious exemplary embodiments of the present invention, as well asvarious alternatives and modifications thereof. It is intended that thescope of the present invention be defined by the Claims appended heretoand their equivalents.

What is claimed is:
 1. A heat pump system for a vehicle, the systemincluding: a cooling apparatus including a radiator, a first water pump,a first valve, and a reservoir tank which are connected through acoolant line, and configured to circulate a coolant in the coolant lineto cool at least one electrical component mounted in the coolant line; abattery cooling apparatus including a battery coolant line connected tothe reservoir tank through a second valve, and a second water pump and abattery module which are connected through the battery coolant line tocirculate the coolant in the battery module; a heating apparatusincluding a heating line connected to the coolant line through a thirdvalve to heat a vehicle interior by use of a coolant and a third waterpump mounted on the heating line, and a heater; a chiller mounted in abranch line which is connected to the battery coolant line through thesecond valve, and connected to a refrigerant line of an air conditionerthrough a refrigerant connection line, to adjust a temperature of thecoolant by performing heat exchange between the coolant which isselectively introduced into a connection line connecting the coolantline and the branch line through the first valve, and the branch lineand a refrigerant which is selectively supplied from the airconditioner; and a gas injection unit mounted in the air conditioner andbypassing a portion of the refrigerant among the refrigerant passingthrough the condenser connected to the heating line such that thecoolant circulating the heating apparatus passed through to thecompressor to increase a flow rate of the refrigerant circulatingthrough the refrigerant line.
 2. The heat pump system for the vehicle ofclaim 1, wherein a first end portion of the connection line is connectedto the coolant line through the first valve and a second end portion ofthe connection line is connected to the between the second valve and thechiller, and wherein the heater is mounted inside a heating,ventilation, and air conditioning (HVAC) module included in the airconditioner.
 3. The heat pump system for the vehicle of claim 2, whereinwhen the battery module is heated, the connection line is opened in astate in which the coolant line connected to the radiator is closedthrough operation of the first valve, the branch line is opened throughan operation of the second valve, a portion of the battery coolant lineconnected to the reservoir tank is closed based on the branch line, thecoolant circulates along the battery coolant line and the branch linethrough operation of the second water pump, in the heating apparatus,the coolant line and the heating line are connected through operation ofthe third valve, in the cooling apparatus, the coolant with thetemperature increased by waste heat of the at least one electricalcomponent circulates through the heating line through operation of thethird water pump, and a heated coolant introduced from the heating lineand the coolant line is flowed into the branch line from the coolantline through the connection line, and is supplied to the battery moduleconnected through the battery coolant line and the branch line.
 4. Theheat pump system for the vehicle of claim 1, wherein the air conditionerincludes: an HVAC module including an evaporator which is connected tothe refrigerant line and a door configured to control outside airpassing through the evaporator to be selectively introduced into theheater depending on cooling, heating, and heating/dehumidifying modes ofthe vehicle; the condenser connected to the heating line to circulate acoolant therein to perform heat exchange between the coolant and arefrigerant supplied through the refrigerant line; a compressorconnected between the evaporator and the condenser through therefrigerant line; a first heat exchanger mounted on the refrigerant linebetween the condenser and the evaporator; a first expansion valvemounted in the refrigerant line between the first heat exchanger and theevaporator; a second expansion valve mounted in the refrigerantconnection line; an accumulator mounted in the refrigerant line betweenthe evaporator and the compressor and connected to the refrigerantconnection line; and a third expansion valve mounted in the refrigerantline between the condenser and the heat exchanger.
 5. The heat pumpsystem for the vehicle of claim 4, wherein the first heat exchangercondenses or evaporates the refrigerant condensed in the condenserthrough heat exchange with the outside air depending on a selectiveoperation of the third expansion valve.
 6. The heat pump system for thevehicle of claim 4, wherein the second expansion valve expands therefrigerant inflowed through the refrigerant connection line to flow tothe chiller when cooling the battery module by the coolantheat-exchanged with the refrigerant.
 7. The heat pump system for thevehicle of claim 4, wherein the third expansion valve selectivelyexpands the refrigerant inflowed to the first heat exchanger in theheating mode and the heating/dehumidification mode of the vehicle. 8.The heat pump system for the vehicle of claim 4, wherein the gasinjection unit includes: a second heat exchanger mounted on therefrigerant line between the condenser and the heat exchanger; a bypassline having a first end portion connected to the refrigerant linebetween the condenser and the second heat exchanger, and a second endportion connected to the compressor by passing through the second heatexchanger; and a fourth expansion valve mounted on the bypass line at afront of the second heat exchanger.
 9. The heat pump system for thevehicle of claim 8, wherein the fourth expansion valve expands therefrigerant inflowed to the bypass line through the condenser in theheating mode or the heating/dehumidification mode of the vehicle. 10.The heat pump system for the vehicle of claim 4, wherein the gasinjection unit includes: a flash tank mounted on the refrigerant linebetween the condenser and the first heat exchanger and dividing therefrigerant passing through the condenser into a gaseous refrigerant anda liquid refrigerant to be selectively exhausted; a bypass lineconnecting the flash tank and the compressor, and selectively supplingthe refrigerant of the gaseous state from the flash tank to thecompressor; a bypass valve mounted on the bypass line; and a fourthexpansion valve mounted on the refrigerant line between the condenserand the flash tank.
 11. The heat pump system for the vehicle of claim10, wherein the fourth expansion valve expands the refrigerant inflowedto the bypass line through the condenser in the heating mode or theheating/dehumidification mode of the vehicle.
 12. The heat pump systemfor the vehicle of claim 4, wherein the HVAC module further includes anair heater mounted at a side of the evaporator, with the heaterinterposed therebetween to selectively heat outside air passing throughthe heater, and wherein the air heater is operated to raise atemperature of the outside air passing through the heater when atemperature of a coolant supplied to the heater is lower than a targettemperature for internal heating.
 13. The heat pump system for thevehicle of claim 4, wherein when the battery module is cooled in thecooling mode of the vehicle, the coolant circulates through the coolantline by operation of the first water pump in the cooling apparatus; theconnection line is closed through an operation of the first valve; inthe battery cooling apparatus, the branch line is opened through anoperation of the second valve, and the coolant passing through thechiller through operation of the second water pump is supplied to thebattery module along the battery coolant line and the branch line in astate in which the battery coolant line connected to the reservoir tankbased on the branch line is closed; in the heating apparatus, thecoolant line and the heating line are connected through operation of thethird valve so that the coolant is supplied from the cooling apparatus;in the air conditioner, in a state that the refrigerant connection lineis opened through operation of the second expansion valve, therefrigerant circulates along the refrigerant line and the refrigerantconnection line; the first and second expansion valves expand therefrigerant so that the expanded refrigerant is respectively supplied tothe evaporator and the chiller; the third expansion valve inflows therefrigerant supplied from the condenser to the heat exchanger; and thegas injection unit is deactivated.
 14. The heat pump system for thevehicle of claim 13, wherein the heating apparatus supplies the coolantsupplied from the cooling apparatus through operation of the third waterpump to the condenser, and wherein the condenser condenses therefrigerant through heat exchange with the coolant, and the first heatexchanger additionally condenses the refrigerant inflowed from thecondenser through heat exchange with the outside air.
 15. The heat pumpsystem for the vehicle of claim 4, wherein when recovering a waste heatof an external heat source, the at least one electrical component, andthe battery module in the heating mode of the vehicle, the connectionline is opened through operation of the first valve; in the coolingapparatus, on a basis of the connection line, a portion of the coolantline connected to the radiator and a portion of the coolant lineconnecting the radiator and the reservoir tank are closed throughoperation of the first valve, and the coolant passing through the atleast one electrical component is supplied to the chiller along theopened connection line without passage through the radiator throughoperation of the first water pump; in the battery cooling apparatus, thebranch line and the battery coolant line are opened through operation ofthe second valve, respectively, and the coolant passing through thebattery module is supplied to the chiller along the branch line throughoperation of the second water pump; the coolant line and the heatingline respectively form an independent closed circuit through operationof the third valve; in the heating apparatus, the coolant circulatesalong the heating line through operation of the third water pump; in theair conditioner, the refrigerant line connecting the condenser and theevaporator is closed through operation of the first expansion valve; therefrigerant connection line is opened through operation of the secondexpansion valve; the second expansion valve expands the refrigerantsupplied to the refrigerant connection line to be supplied to thechiller; the third expansion valve expands the refrigerant supplied fromthe condenser to be supplied to the heat exchanger; and the gasinjection unit is operated.
 16. The heat pump system for the vehicle ofclaim 4, wherein in the heating/dehumidification mode of the vehicle,the connection line is opened through an operation of the first valve;in the cooling apparatus, on a basis of the connection line, a portionof the coolant line connected to the radiator and a portion of thecoolant line connecting the radiator and the reservoir tank are closedthrough operation of the first valve, and the coolant passing throughthe at least one electrical component is supplied to the chiller alongthe opened connection line without passage through the radiator throughoperation of the first water pump; in the battery cooling apparatus, thebranch line is opened through an operation of the second valve to closethe battery coolant line except a portion of the battery coolant lineconnected to the reservoir tank with respect to the branch line; thecoolant discharged from the chiller is introduced into the reservoirtank through the branch line and the opened the battery coolant line;the coolant line and the heating line respectively form an independentclosed circuit through operation of the third valve; in the heatingapparatus, the coolant circulates along the heating line throughoperation of the third water pump; in the air conditioner, therefrigerant is circulated along the refrigerant line and the refrigerantconnection line opened through operation of the first and secondexpansion valves, respectively; the first and second expansion valvesexpand the refrigerant so that the expanded refrigerant is respectivelysupplied to the evaporator and the chiller; and the gas injection unitis operated.
 17. The heat pump system for the vehicle of claim 1,wherein when cooling the at least one electrical component and thebattery module by use of the coolant, the connection line and the branchline are closed through operation of the first and second valves, thecoolant, which is cooled in the radiator and stored in the reservoirtank, is supplied to the at least one electrical component throughoperation of the first water pump, and the coolant stored in thereservoir tank is circulated in the battery coolant line connected tothe reservoir tank through operation of the second valve to be suppliedto the battery module.
 18. The heat pump system for the vehicle of claim1, wherein when using waste heat of the at least one electricalequipment in a heating mode of the vehicle without the operation of theair conditioner, the connection line is opened through an operation ofthe first valve; in the cooling apparatus, on a basis of the connectionline, a portion of the coolant line connected to the radiator and aportion of the coolant line connecting the radiator and the reservoirtank are closed; the branch line is opened through an operation of thesecond valve to close the battery coolant line except a portion of thebattery coolant line connected to the reservoir tank with respect to thebranch line; the coolant whose the temperature is increased whilepassing through the at least one electrical component by the operationof the first water pump is supplied to the heater along the heating lineconnected through the third valve without passing through the radiator;the coolant discharged from the heater is supplied into the chilleralong the heating line, the third valve, the coolant line, theconnection line, and the branch line; and the coolant discharged fromthe chiller is introduced into the reservoir tank through the branchline and the opened battery coolant line.
 19. The heat pump system forthe vehicle of claim 18, wherein the first valve opens the coolant lineconnected to the radiator to allow a portion of the coolant passingthrough the at least one electrical component to flow into theconnection line and the remaining coolant to flow into the radiator whenthe at least one electrical component is overheated.
 20. The heat pumpsystem for the vehicle of claim 1, wherein the gas injection unit isoperated in a heating mode or a heating/dehumidification mode of thevehicle.